<!DOCTYPE html>
<html lang="zh">

<head>
    <title></title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
    <link href="../css/style.css" rel="stylesheet"> </head>

<body>
    <div id="myApp">
        <p>今年3月3日发卖的任天堂新一代主机Switch的价格是：{{price}}円，含税价格为：{{priceInTax}}円，折合人民币为：{{priceChinaRMB}}元。</p>
        <button @click="btnClick(10000)">加价10000円</button>
    </div>
    <script>
        var myApp = new Vue({
            el: '#myApp',
            data: {
                price: 0,
                priceInTax: 0,
                priceChinaRMB: 0,
            },
            watch: {
                price: function(newVal, oldVal) {
                    console.log(newVal, oldVal);
                    this.priceInTax = Math.round(this.price * 1.08);
                    this.priceChinaRMB = Math.round(this.priceInTax / 16.75);
                },
            },
            methods: {
                btnClick: function(newPrice) {
                    this.price += newPrice;
                },
            },
        });
        myApp.price = 29980;
    </script>
</body>

</html>